Theory Crafting LoR cards.

[foxy_seductress]

Sona: 1/2 for (2) mana with quick attack. When Sona is played or at the beginning of turn, create in hand one of three fleeting [songs]. Whenever you play three fast or burst spells, Sona creates a [Power chord] in hand.

Level Up: Level Up: Play three or more [Power Chords] this game.

Leveled up Sona
2/3 for (3) mana, with quick attack and whenever you play a fast or burst spell grant Sona +1/+0 until end of turn.

Power Chord: (Focus) Mana cost (0)
Create a song in hand, or a reduce the mana cost of a song in hand to 0.

Hymn of Valor: (Burst) mana cost (3)
Give Sona and Adjacent Allies +1/+1 this turn and deal 1 damage to two random enemies.

Aria of Perseverence: (Burst) mana cost (6)
Heal Sona and Adjacent Allies 3 and grant them barrier.

Song of Celerity: (Fast) mana cost (6)
Give Sona and Adjacent Allies double attack until end of turn

Hero Spell: Crescendo! (Fast) mana cost (6)
Stun all enemy champions this round and deal two damage to them.

Cho'Gath: 5/5 for (5) Mana, with Overwhelm and whenever this unit kills a unit, give it +1/+1 or +2/+2 for a champion, obliterate the slain card, and heal him completely.

Level up: Round end, if Cho'Gath is 10/10 or larger.

Leveled Up Cho'Gath:
10/10 for (6) Mana, with overwhelm, fearsome, and whenever this unit kills a unit, give it +2/+2 or +4+4 for a champion, obliterate the slain card, and heal him completely.

Hero Spell: Vorpal Spikes (Slow) mana cost (4)
Cho Gath's next strike also deals 1 damage to all enemies.